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Upstream Air Fuel Ratio Sensor
Fits Mazda MX-5 Miata 2.0L (2016-2018)
Replaces OE: 234-5720, P51B188GX
Resolves Symptoms
- Check Engine Light (P0420/P0171)
- Rough Idle & Hesitation
- Poor Fuel Economy (MPG)
- Failed Emissions Inspection
Estimated Delivery
Free
Ordered
Oct 5
Prepared
Oct 5-Oct 6
Delivered
Oct 7-Oct 10
Dispatched quickly from local US warehouses.
2-Year Warranty
🛡️ Quality Coverage: Protects against any manufacturing defects for 2 full years.
🔄 Free Replacement: Brand-new replacement for free if quality issues occur.
30-Day Return & Refund
📦 Free Returns: Zero costs to you if the product has quality issues.
💰 Full Refunds: 100% money-back guarantee within 30 days for defective items.
5-Step Fitment Guide
- Check OE: Find original part no. & plug.
- Compare Photos: Match plug with our images.
- Verify YMM: Confirm via fitment tool.
- Review Specs: Check pins & dimensions.
- Purchase: Buy confidently once matched!
Review Rewards
Share an install photo & review to unlock:
- Under $50 Orders: 3% Off Next Order
- $50+ Orders: 5% Direct Cashback
*Email screenshot of your review to support to claim.
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$35.95
-
No hidden fees: What you see is what you pay.
-
Restore performance: Fix issues and drive with confidence.
Check Engine Light? Find Your Symptoms
🌬️ O2 & A/F Sensors
- P0134No Activity Detected
- P0135Heater Circuit Malfunction
- P0137/38Circuit Low/High Voltage
- P2195Signal Stuck Lean
- P0030/31Heater Control Circuit
⛽ Fuel & Air Mixture
- P0171/74System Too Lean
- P0172System Too Rich
- P2096Post-Catalyst Trim Too Lean
- P0087Fuel Rail Pressure Low
- P0201-04Injector Circuit Open
♻️ Catalytic Converters
- P0420Efficiency Below Threshold (B1)
- P0430Efficiency Below Threshold (B2)
⚡ Ignition / Misfires
- P0300Random Misfire
- P0301-06Cylinder-Specific Misfire
Automotive-Leader Sensors
Vehicle Compatible
|
Year
|
Make
|
Model
|
Engine/Displacement
|
|---|---|---|---|
|
2016, 2017-2018
|
Scion
|
iA
|
1.5L l4
|
|
2016, 2017-2018
|
Toyota
|
Yaris iA
|
1.5L l4
|
|
2016-2018
|
Mazda
|
CX-3 GS
|
2.0L l4
|
|
2016-2018
|
Mazda
|
CX-3 GT
|
2.0L l4
|
|
2016-2018
|
Mazda
|
CX-3 GX
|
2.0L l4
|
|
2016-2018
|
Mazda
|
CX-3 Grand Touring
|
2.0L l4
|
|
2016-2018
|
Mazda
|
CX-3 Sport
|
2.0L l4
|
|
2016-2018
|
Mazda
|
CX-3 Touring
|
2.0L l4
|
|
2017-2018
|
Mazda
|
CX-3 i Grand Touring
|
2.0L l4
|
|
2017-2018
|
Mazda
|
CX-3 i Sport
|
2.0L l4
|
|
2017
|
Mazda
|
CX-3 I Touring
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata Club
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata GS
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata GT
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata GX
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata Grand Touring
|
2.0L l4
|
|
2016-2018
|
Mazda
|
MX-5 Miata Sport
|
2.0L l4
|
|
2017-2018
|
Mazda
|
MX-5 Miata RF Club
|
2.0L l4
|
|
2017-2018
|
Mazda
|
MX-5 Miata RF GS
|
2.0L l4
|
|
2017-2018
|
Mazda
|
MX-5 Miata RF GT
|
2.0L l4
|
|
2017-2018
|
Mazda
|
MX-5 Miata RF Grand Touring
|
2.0L l4
|
Product Specifications
Warranty & Support: 2 Years + Pre-sale Load Test + 24/7 Technical Support
|
Item
|
Specification
|
|---|---|
|
Core Part Number
|
234-5720
Interchange: 2345720, 234 5720, P51B-18-8GX, P51B188GX, P51B18-8GX, P51B 18 8GX, 27034, 450-35075 |
|
Position
|
Exhaust System, Upstream (Pre-Catalytic Converter)
|
|
Key Parameters
|
- Sensor Type: Heated Wide-Band (AFR) Oxygen Sensor
- Wire Quantity: 5 Wires - Wire Harness Length: 12.36 IN - Fit Type: Specific (confirm by VIN / existing sensor label before ordering) |